Watch charging assembly

Abstract

A watch charging assembly 10 has a coil 22 , a membrane 24 and a back plate 12 . The coil 22 is configured to pass electric current received at a first or second contact pad 27, 28 . The membrane 24 is affixed to the coil 22 forming a membrane and coil assembly 20 . The back plate 12 has a pair of conductive inserts 30 . Each conductive insert 30 is aligned with and contacts each contact pad 27, 28 . The back plate 12 with the coil 22 and membrane 24 form the charging assembly 10 . The charging assembly 10 is configured to form a bottom or underside or, alternatively, be attached to a bottom or underside of a rechargeable battery operated wristwatch 100 and when worn, the charging assembly 10 receives electric current from the wearer to charge a rechargeable battery of the wristwatch 100 . The coil 22 can be a pancake coil.

What is claimed is: 
     
       1. A watch charging assembly comprising:
 a coil configured to pass electric current received at a first or second contact pad; 
 a membrane affixed to the coil; 
 a back plate having a pair of conductive inserts, each conductive insert aligned with and contacting each contact pad, the back plate with the coil and membrane form the watch charging assembly, wherein the coil is a pancake coil having a spirally wound wire extending from a center location or slightly offset from a center location outward to an outer location, the wire extending through a first pass through connection at or slightly offset from the center location on a first side of the membrane, the coil passes through the first pass through connection and extends to the first contact pad from the first pass through connection on a coil side of the membrane, the coil being spirally wound from the first pass through connection on the coil side of the membrane to a second pass through connection on the coil side of the membrane at the second contact pad to complete a charging circuit; and 
 wherein the watch charging assembly is configured to be worn on a wearer's wrist and positioned between the wearer's wrist and a rechargeable battery operated wristwatch, the charging assembly held to a bottom or underside of the wristwatch and when worn, the watch charging assembly receives electric current from the wearer to provide a slow continuous charge to the rechargeable battery of the wristwatch. 
 
     
     
       2. The watch charging assembly of  claim 1 , wherein the membrane is affixed to the back plate. 
     
     
       3. The watch charging assembly of  claim 2 , wherein the membrane is glued to the back plate. 
     
     
       4. The watch charging assembly of  claim 1  further comprises:
 a plurality of magnets configured to be positioned in the back plate along a periphery of the back plate to hold the charging assembly to the bottom or underside of the watch magnetically. 
 
     
     
       5. The watch charging assembly of  claim 1  further comprises:
 a plurality of elastomeric suction cups configured to hold the charging assembly to the bottom or underside of the watch by vacuum when the suction cups are compressed against the watch. 
 
     
     
       6. The watch charging assembly of  claim 1 , wherein the bottom plate has a plurality of snap clips around an edge of the bottom plate configured to be attached to a watch with edges or grooves configured to receive the snap clips to attach the assembly to the watch. 
     
     
       7. The watch charging assembly of  claim 1 , wherein the back plate has a pair of holes for receiving the conductive inserts, each hole sized to receive one of the conductive inserts. 
     
     
       8. The watch charging assembly of  claim 7 , wherein each conductive insert comprises:
 a non-metal housing extending around a perimeter of the conductive insert and configured to fit into the holes of the back plate; and 
 a metal conductive portion configured to contact a wearer's skin. 
 
     
     
       9. The watch charging assembly of  claim 1 , wherein the metal conductive portion has a plurality of pins, each pin projecting from the metal portion to a tip end to increase contact intensity at the skin. 
     
     
       10. The watch charging assembly of  claim 9 , wherein the pins of the plurality of pins are closely spaced to share the contact pressure at the skin. 
     
     
       11. The watch charging assembly of  claim 1 , wherein the coil is hermetically sealed in the membrane. 
     
     
       12. The watch charging assembly of  claim 1 , wherein the contact pads of the coil are engaged and in contact with the metal portion of the conductive inserts to pass electric current into the coil. 
     
     
       13. The watch charging assembly of  claim 1 , wherein the metal conductive portion of the inserts is made of highly conductive metal. 
     
     
       14. The watch charging assembly of  claim 13 , wherein the highly conductive metal is one of copper, gold, gold plated metal, silver or other conductive metallic material. 
     
     
       15. The watch charging assembly of  claim 1 , wherein the back plate is made of non-conductive plastic. 
     
     
       16. The watch charging assembly of  claim 1 , wherein the charging assembly is configured to attach to a smart wristwatch configured to be wirelessly charged by a coil. 
     
     
       17. A watch with a built-in charging assembly comprises:
 a watch with a rechargeable battery and configured to be recharged through an inductive coil; and 
 a watch charging assembly having: 
 a coil configured to pass electric current received at a first or second contact pad; 
 a membrane affixed to the coil; 
 a back plate having a pair of conductive inserts, each conductive insert aligned with and contacting each contact pad, the back plate with the coil and membrane form the charging assembly, wherein the coil is a pancake coil having a spirally wound wire extending from a center location or slightly offset from a center location outward to an outer location, the wire extending through a first pass through connection at or slightly offset from the center location on a first side of the membrane, the coil passes through the first pass through connection and extends to the first contact pad from the first pass through connection on a coil side of the membrane, the coil being spirally wound from the first pass through connection on the coil side of the membrane to a second pass through connection on the coil side of the membrane at the second contact pad to complete a charging circuit; and 
 wherein the charging assembly is configured to be a bottom or underside of a rechargeable battery operated wristwatch, and when worn, the charging assembly receives electric current from the wearer to charge the rechargeable battery of the wristwatch. 
 
     
     
       18. The watch with a built-in charging assembly of  claim 17  further comprises:
 a wrist band configured to be attached to opposite ends of the watch, the wrist band having a pair of bands, each band having a conductive insert to receive electric current.